7907919993 has 6 divisors (see below), whose sum is σ = 11422551114. Its totient is φ = 5271946656.

The previous prime is 7907919973. The next prime is 7907919997. The reversal of 7907919993 is 3999197097.

It can be written as a sum of positive squares in only one way, i.e., 6913589904 + 994330089 = 83148^2 + 31533^2 .

It is not a de Polignac number, because 7907919993 - 2¹³ = 7907911801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7907919993.

It is not an unprimeable number, because it can be changed into a prime (7907919997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439328880 + ... + 439328897.

It is an arithmetic number, because the mean of its divisors is an integer number (1903758519).

Almost surely, 2^7907919993 is an apocalyptic number.

It is an amenable number.

7907919993 is a deficient number, since it is larger than the sum of its proper divisors (3514631121).

7907919993 is a wasteful number, since it uses less digits than its factorization.

7907919993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878657783 (or 878657780 counting only the distinct ones).

The product of its (nonzero) digits is 8680203, while the sum is 63.

The square root of 7907919993 is about 88926.4864536995. The cubic root of 7907919993 is about 1992.2970363472.

The spelling of 7907919993 in words is "seven billion, nine hundred seven million, nine hundred nineteen thousand, nine hundred ninety-three".